GM Service Manual Online
For 1990-2009 cars only

The radio has a CLOCK button for adjusting the time and date. The date does not automatically display. To see the date press CLOCK while the radio is on. The date with display times out after a few seconds and goes back to the normal radio and time display. To adjust the time and date:

  1. Turn the ignition key to ACC/ACCESSORY or ON/RUN.
  2. Press the PWR VOL (Power/Volume) knob to turn on the radio.
  3. Press the CLOCK button, and the HR, MIN, MM, DD, YYYY (hour, minute, month, day, and year) categories display.
  4. Press the button under the category to be adjusted.
  5. To increase the time or date, do one of the following: turn the TUNE ADJ (Tune/Adjust) knob clockwise, press SEEK/TRACK , press FWD (Forward), or continue to press the button under the category to be adjusted.
  6. To decrease the time or date, do one of the following: turn the TUNE ADJ knob counterclockwise, press SEEK/TRACK , or press REV (Reverse).
  7. To save the settings, press the CLOCK button, or let the display time out.

To change the time default setting from 12 hour to 24 hour, and to change the date default setting from month/day/year to day/month/year:

  1. Press the CLOCK button and then the button below the forward arrow label on the display. The 12H and 24H, and the date MMDD (month and day) and DDMM (day and month) categories will display.
  2. Press the button below the 12H or 24H label, and the date MMDD (month and day) or DDMM (day and month) label to choose how the radio displays the time and date.
  3. To save the settings, press the CLOCK button, or let the screen time out.